Between 1900 and 2000, the ozone (O3 ) levels in New York City went from 0.098 ppm to 0.086 ppm. What was the percent change in ozone levels?

Nitrogen dioxide reacts with water to form nitric acid and nitrogen monoxide according to the equation: 3no2(g)+h2o(l)→2hno3(l)+no(g) part a suppose that 4.2 mol no2 and 0.50 mol h2o combine and react completely. which reactant is in excess? express your answer as a chemical formula. nothing

Gymnast always perform on padded mats. how does the mats protect the gymnast

Suppose the universe were completely empty except for one object-a solid sphere moving through space of 100 km/s. what sort of path would the object be moving in? explain your answer